On the same day that Liao Loach arrived at Yokohara Fort with the trophies, a strange Mongolian scout also came to the vicinity of Yokohara Fort.

There were only a dozen of these cavalrymen, but they marched at the same height, revealing a powerful aura in their every move, and the horses they rode were unusually tall, unlike ordinary Mongolian horses.

Unlike the usually arrogant and arrogant Mongol cavalry, this group of scouts behaved very low-key, and could even be described as quiet.

In the face of the Thunderbolts' drive, they simply retreated calmly, without firing a single arrow. According to the observation of Cao Ergou, who was stationed at Hengyuan Fort, this group of scout cavalry should be the personal guards of the commander of the Mongolian army, not the Mongolian cavalry stationed in Dayi and Yongkang.

The Mongol cavalry of these two cities could also be distinguished because they often harassed near Yokohara Fort. The two cities of Dayi and Yongkang were actually stationed by the Mongol Han army, not the Mongols, and most of them spoke Chinese.

And the occasional loud shouts of these scouts also revealed their Mongol identity. These scouts coiled near Yokohara Fort for two days before retreating, during which Cao Ergou also ordered people to drive them out of the fort several times, but it was obviously ineffective to chase the cavalry with infantry.

These detectives were like flies flying around in front of him, which really upset Cao Ergou, and made him finally hold back the idea of shooting with artillery.

It is said that Huang Dagen's sneak attack on Chengdu made him eager to try, and he couldn't wait to lead his troops to Chengdu to directly destroy the Mongols.

It's just that Ouyang Xuan's order to him was to take the six companies of the field battalion to hold the Hengyuan Fort, and no artillery should be used for a large-scale siege by the Mongols.

In fact, not only Yokohara Fort, but also various places under the rule of the Thunderbolt Army, such as Wugen Mountain, Meihua Village, and Xinjin Castle, the Mongol cavalry was extremely active.

A group of cavalry even traveled through the rootless mountains for half a day, and the people in the mountains had long been hiding under the warning, and the Mongolian army had nothing to gain.

Thunderbolt scouts also found that there was also a lot of travel between the Mongol-controlled states and counties to pass military information.

The Mongols in Chongqing Fucheng drove a large number of people to cut down trees and lay wooden stakes in the river, trying to block the passage of ships, but they were all uprooted by Liao Loach at night, but the Mongols refused to give up.

According to Ouyang Xuan's order, Liao Loach took two companies of the naval battalion, a heavy artillery ship and four light artillery boats to be stationed in Huaguoshan and Huangjiadang.

When Liao Loach went to pull the wooden stake for the fourth time, he found that the Mongols had sacrificed their blood and actually connected the wooden stakes with thick iron chains.

Destroying this thing is not difficult for the Thunderbolts with gunpowder, it just needs to be blasted a few more times.

Just as Liao Loach was about to make a move, Ouyang Xuan's order arrived, making him no longer attack but hibernating.

In fact, since the Mongols had not discovered Huaguoshan and Huangjiadang camps, they did not know that there were still Thunderbolt naval troops in the upper reaches of Fucheng.

Since the Mongol army in Fucheng did not have a naval army, and the wooden stakes in Liao's loach tug-of-war were all at night, they did not know whether the attack came from upstream or downstream.

Without interference, the Mongol army quickly completed the work of locking the river with iron chains, and built a wooden fort on the west bank of the river to protect the chains.

In this way, the Mongols achieved their goal: to cut off the link between Yokohara Fort and Shinjin Castle. This action of the Mongols made many high-ranking Thunderbolt army quite worried, and they were worried about the safety of Xinjin City.

Ouyang Xuan was not worried about this, in his opinion, although the city defense of Xinjin City was not as good as Hengyuan Fort, it was reinforced with reinforced concrete by the technicians of the construction company, and the degree of solidity far exceeded that of ordinary cities.

The castle is surrounded by water on three sides, and the only part of the city wall facing the land part is wide and deep enough to sail a boat.

More importantly, the fortress artillery of Xinjin City plus the artillery on the warship, the Mongolian army could never break the city without 10,000 people.

What's more critical is that the Mongolian army does not have the right to control water, and even if it pays heavy casualties to break the city, it will get an empty city.

The Thunderbolts in the city could retreat to the ships and retreat to the mountains by water. It is said that the iron chains of Chongqing Mansion City could not stop the Thunderbolt artillery warships, and even if they could be blocked, the Thunderbolt Army could retreat down the river to Jiading Mansion and other areas controlled by the Song army in order to survive.

There is an important premise for the strategic location of Xinjin City, that is, to grasp the right to control water. The Mongols ruled the world, not only because of their strong combat power, but also because there were many masters of strategy and tactics, who obviously understood this truth.

Therefore, Ouyang Xuan was sure that the target of the Mongol army's attack was Hengyuan Fort, and only by attacking the mountains and uprooting the foundation of the Thunderbolt army could the rule of western Sichuan be stable, and then become a stable rear for Meng Ke Khan's attack on eastern Sichuan.

To say that the Mongols attacked the mountains with a short and long time, but they had to do it. To attack Wanjiaping, Hengyuan Fort and Wanjiabao are two mountains that lie in front of the Mongols.

Only six companies of Cao Ergou's field battalion were stationed at Yokohara Fort, equipped with more than 40 large and small artillery pieces, and Wanjiabao had even fewer personnel, and only three companies of the garrison battalion led by Yu Zhu, including the teaching company.

Although the number was small, Ouyang Xuan believed that the Mongols could be dragged down by adopting conservative tactics that could not be defended.

Of course, he also knew that the Mongolian army was known for its cunning, and would definitely not stupidly come to give away people's heads, but would do anything to win.

So he reminded Cao Ergou that he must be cautious, not only to have the confidence to win, but not to be blind and arrogant.

He told Cao Ergou according to the words of a certain great man: "Strategically we must despise our opponents, and we must attach importance to our opponents tactically."

Sure enough, as Ouyang Xuan expected, at the beginning of July, Mongolian troops from all over western Sichuan gathered in Hengyuan Town one after another.

The commander of the Mongol army attacking Yokohara Fort was the secret Huoli, and he brought 7,000 men this time, including 2,000 cavalry and 5,000 new annexed troops.

You must know that the Mongolian army only has 5,000 cavalry in western Sichuan, and about 10,000 new attached troops.

In addition to the army, the Mongols also drove 15,000 people on this trip, which were used for the transportation and logistics of grain and grass equipment.

In addition, the Mongolian army even brought camp prostitutes, and it seems that they have made sufficient preparations for a long-term attack, and they will not stop until the Perak army is pacified.

More than 20,000 people poured into the town of Yokohara at once, so that the people and horses around Yokohara Fort flowed endlessly, and if there were no swords and weapons, it would be a lively scene.

Due to the large number of Mongolian troops and the scorching heat, the Mongolian army camp was not concentrated in order to prevent the epidemic, but was divided into four camps.

The best camps, naturally, were occupied by the Mongol cavalry. The cavalry camp is located three miles east of Yokohara Fort, which is not only on high ground, but also has a large area of woods to shelter from the heat, and the big tent in the secret fire is also located here.

Because the new annex army was the main force of the siege, they set up camp on the flat land two miles south of Yokohara Fort. It is directly opposite the south gate of Yokohara Fort, close to the Wenjing River, although it is convenient to get water, but the trees are scarce, and the scorching sun and downpour are always inevitable.

But in the eyes of the Mongols, these new annexed troops are just cannon fodder, and if they don't stay here, do they want the Mongol lords to be stationed here?

A little further away from the new annex camp is the Minfu camp. Between the camp of the new annex army and the camp of the people was the camp of grain and grass, which had a higher fence and a deeper and wider ditch, and the Mongol army also sent troops to protect it.

If the Thunderbolts were to attack the camp of the grain and grass baggage, they had to pass through the camp of the new annex army, and they would also be attacked by the Mongol cavalry from the flank.